1 /* $NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the 18 * NetBSD Project. See http://www.NetBSD.org/ for 19 * information about NetBSD. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>> 35 */ 36 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 __RCSID("$NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $"); 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include "namespace.h" 43 #include <sys/param.h> 44 #include <sys/mman.h> 45 #include <sys/stat.h> 46 #include <sys/file.h> 47 48 #include <assert.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <nlist.h> 54 55 #include "nlist_private.h" 56 #ifdef NLIST_ECOFF 57 #include <sys/exec_ecoff.h> 58 #endif 59 60 #ifdef NLIST_ECOFF 61 #define check(off, size) \ 62 ((size_t)off >= mappedsize || (size_t)(off + size) > mappedsize) 63 64 int 65 __fdnlist_ecoff(int fd, struct nlist *list) 66 { 67 struct nlist *p; 68 const struct ecoff_exechdr *exechdrp; 69 const struct ecoff_symhdr *symhdrp; 70 const struct ecoff_extsym *esyms; 71 struct stat st; 72 const char *mappedfile; 73 size_t mappedsize; 74 u_long symhdroff, extstroff; 75 u_int symhdrsize; 76 int rv, nent; 77 long i, nesyms; 78 79 _DIAGASSERT(fd != -1); 80 _DIAGASSERT(list != NULL); 81 82 rv = -1; 83 84 /* 85 * If we can't fstat() the file, something bad is going on. 86 */ 87 if (fstat(fd, &st) < 0) 88 goto out; 89 90 /* 91 * Map the file in its entirety. 92 */ 93 if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) { 94 errno = EFBIG; 95 goto out; 96 } 97 mappedsize = (size_t)st.st_size; 98 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 99 fd, 0); 100 if (mappedfile == MAP_FAILED) 101 goto out; 102 103 /* 104 * Make sure we can access the executable's header 105 * directly, and make sure the recognize the executable 106 * as an ECOFF binary. 107 */ 108 if (check(0, sizeof *exechdrp)) 109 goto unmap; 110 exechdrp = (const void *)mappedfile; 111 112 if (ECOFF_BADMAG(exechdrp)) 113 goto unmap; 114 115 /* 116 * Find the symbol list. 117 */ 118 symhdroff = exechdrp->f.f_symptr; 119 symhdrsize = exechdrp->f.f_nsyms; 120 121 if ((symhdroff + sizeof *symhdrp) > mappedsize || 122 sizeof *symhdrp != symhdrsize) 123 goto unmap; 124 symhdrp = (const void *)&mappedfile[symhdroff]; 125 126 nesyms = symhdrp->esymMax; 127 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms)) 128 goto unmap; 129 esyms = (const void *)&mappedfile[symhdrp->cbExtOffset]; 130 extstroff = symhdrp->cbSsExtOffset; 131 132 /* 133 * Clean out any left-over information for all valid entries. 134 * Type and value are defined to be 0 if not found; historical 135 * versions cleared other and desc as well. 136 * 137 * XXX Clearing anything other than n_type and n_value violates 138 * the semantics given in the man page. 139 */ 140 nent = 0; 141 for (p = list; !ISLAST(p); ++p) { 142 p->n_type = 0; 143 p->n_other = 0; 144 p->n_desc = 0; 145 p->n_value = 0; 146 ++nent; 147 } 148 149 for (i = 0; i < nesyms; i++) { 150 for (p = list; !ISLAST(p); p++) { 151 const char *nlistname; 152 const char *symtabname; 153 154 /* This may be incorrect */ 155 nlistname = N_NAME(p); 156 if (*nlistname == '_') 157 nlistname++; 158 159 symtabname = 160 &mappedfile[extstroff + esyms[i].es_strindex]; 161 162 if (!strcmp(symtabname, nlistname)) { 163 /* 164 * Translate (roughly) from ECOFF to nlist 165 */ 166 p->n_value = esyms[i].es_value; 167 p->n_type = N_EXT; /* XXX */ 168 p->n_desc = 0; /* XXX */ 169 p->n_other = 0; /* XXX */ 170 171 if (--nent <= 0) 172 goto done; 173 break; /* into next run of outer loop */ 174 } 175 } 176 } 177 178 done: 179 rv = nent; 180 unmap: 181 munmap(__UNCONST(mappedfile), mappedsize); 182 out: 183 return rv; 184 } 185 186 #endif /* NLIST_ECOFF */ 187
Indexes created Tue Sep 30 07:10:03 GMT 2025